| 摘要 |
<p>An equalization circuit for a reproduced video signal detects the levels of a reference signal in two different frequency bands and, based on a comparison of the detected levels, selects an equalization curve from a memory (31) and controls the equalization characteristic of an equalizer (11) in the signal path based on the selected equalization curve. For a video frequency signal, low-pass and high-pass filters (25, 26) provide the two frequency bands for level checking, and for a radio frequency signal two band-pass filters (42, 43) provide the frequency bands of interest located above and below the centre colour carrier frequency. The memory (31) contains a number of equalization curves, one of which is selected based upon a comparison using the detected reference signal levels that is performed in a central processing unit (1). <IMAGE></p> |
